@article{ASNSP_1986_4_13_3_427_0,
     author = {Hulek, K. and Okonek, C. and Van de Ven, A.},
     title = {Multiplicity-$2$ structures on {Castelnuovo} surfaces},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {427--448},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 13},
     number = {3},
     year = {1986},
     mrnumber = {881100},
     zbl = {0625.14021},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1986_4_13_3_427_0/}
}